CN103195742B - A kind of mechanical seal for residual heat removal pump - Google Patents
A kind of mechanical seal for residual heat removal pump Download PDFInfo
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- CN103195742B CN103195742B CN201310125969.7A CN201310125969A CN103195742B CN 103195742 B CN103195742 B CN 103195742B CN 201310125969 A CN201310125969 A CN 201310125969A CN 103195742 B CN103195742 B CN 103195742B
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Abstract
The invention discloses a kind of mechanical seal for residual heat removal pump in nuclear power equipment field, comprise pump cover and fixedly sleeved gland seal device on pump shaft; Described gland seal device comprises: machine envelope axle sleeve, rotating seat, rotating ring, machine sealed cover, stationary seat, stationary ring and restrictor ring, described rotating ring, described stationary ring, forming machine envelope cooling chamber between described machine sealed cover and described pump cover; Described machine envelope cooling chamber by be positioned at described pump cover circumferentially the import of machine seal cooling water be communicated with external heat exchanger with the outlet of machine seal cooling water; Described rotating ring, described stationary ring, described restrictor ring, described machine sealed cover and described machine seal forming machine envelope leakage chamber between axle sleeve.Its technique effect is: in machine envelope cooling chamber, the flowing velocity of reactor coolant is accelerated, the temperature of reactor coolant reduces, decrease the impact of reactor coolant for gland seal device, ensure that when residual heat removal pump transfer reaction reactor coolant, the validity of mechanical seal.
Description
Technical field
The present invention relates to a kind of mechanical seal for residual heat removal pump in nuclear power equipment field.
Background technique
Residual heat removal pump is the core triplex of million kilowatt nuclear power station reactor, its Main Function is the waste heat of discharging reactor coolant when reactor shutdown, namely the waste heat of Residual heat removal transport pump reactor coolant meets the cooling requirement of nuclear power station to residual-heat exchanger, and then ensured nuclear power station reliability of operation, Security, it occupies irreplaceable effect in nuclear power station.
In residual heat removal pump, the maximum temperature of pump chamber is 204.4 DEG C, need mechanical seal can bear the effect of high temperature to mechanical seal, during residual heat removal pump design, require that the temperature that mechanical seal can be born is 215.6 DEG C, require that mechanical seal is when pump chamber temperature is the highest, mechanical seal can not be lost efficacy, and current residual heat removal pump, mechanical seal just starts when the temperature of reactor coolant is 170 DEG C to occur the phenomenons such as leakage, inefficacy.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of mechanical seal for residual heat removal pump, it can remain effective when Residual heat removal transport pump reactor coolant, does not leak.
A kind of technological scheme realizing above-mentioned purpose is: a kind of mechanical seal for residual heat removal pump, comprises pump cover and fixedly sleeved gland seal device on pump shaft;
Described gland seal device comprises: machine envelope axle sleeve, rotating seat, rotating ring, machine sealed cover, stationary seat, stationary ring and restrictor ring, described machine envelope axle sleeve is fixedly sleeved on described pump shaft, the fixedly sleeved bottom at described machine envelope axle sleeve of described rotating seat, described rotating ring are fixed on described rotating seat, described machine sealed cover is fixed on the end face of described pump cover, the end face of described stationary seat is connected with the bottom surface elasticity of described machine sealed cover, described stationary ring is fixed on described stationary seat, makes the bottom surface forced contact of the end face of described rotating ring and described stationary ring; Described restrictor ring is between described machine envelope axle sleeve and described machine sealed cover radial direction;
Described rotating ring, described stationary ring, described restrictor ring, between described machine sealed cover and described pump cover forming machine envelope cooling chamber; Described machine envelope cooling chamber by be positioned at described pump cover circumferentially the import of machine seal cooling water be communicated with external heat exchanger with the outlet of machine seal cooling water;
Described rotating ring, described stationary ring, described machine sealed cover, described restrictor ring, forming machine envelope leakage chamber between described machine sealed cover and described machine envelope axle sleeve.
Further, the machine that is circumferentially also provided with of described pump cover envelope exhaust port, described machine envelope exhaust port comprises: the radial direction through hole be communicated with described heat exchanger by described machine envelope cooling chamber, and by outlet pipe that the bottom surface of described pump cover is communicated with described radial direction through hole.
Further, the machine that is circumferentially also the provided with envelope of described pump cover leaks interface, described machine envelope leaks the radial blind holes that interface is the described heat exchanger of a connection, is provided with drainage tube in described machine sealed cover, and described machine envelope leakage chamber and described machine are sealed and leaked orifice by described drainage tube.
Further, the inner circumference of described machine sealed cover is fixed with seal ring, and described seal ring is positioned at the below of described restrictor ring, and the bottom surface of described seal ring and the end face of described stationary ring are fixed, and the excircle of described seal ring and the inner circumference of described stationary seat are fixed.
Further, the end face of described stationary seat is connected with several springs of underrun of described machine sealed cover, and these several springs are all in stress, makes the bottom surface forced contact of the end face of described stationary ring and described stationary ring.
Further, described rotating seat inner circumference and described machine seal between sleeve outer circle week radial direction and leave radial clearance, and described rotating ring is arranged in this radial clearance, and the inner circumference of the excircle of described rotating ring and described rotating seat is fixed.
Further, described machine sealed cover and described restrictor ring are fixed by the baffle plate being positioned at described machine sealed cover and described restrictor ring end face.
Have employed the technological scheme of a kind of mechanical seal for residual heat removal pump of the present invention, namely in existing mechanical seal, eliminate pump efficiency ring, make the technological scheme of direct forming machine envelope cooling chamber between the rotating ring of pump cover and gland seal device, stationary ring, machine sealed cover.Its technique effect is: in machine envelope cooling chamber, the flowing velocity of reactor coolant is accelerated, the temperature of reactor coolant reduces, decrease the impact of reactor coolant for gland seal device, ensure that when residual heat removal pump transfer reaction reactor coolant, the validity of mechanical seal.
Accompanying drawing explanation
Fig. 1 is a kind of mechanical connection heat exchanger schematic diagram for residual heat removal pump of the present invention.
Fig. 2 is the structural representation of a kind of mechanical seal for residual heat removal pump of the present invention.
Fig. 3 is of the present invention a kind of for gland seal device structural representation in the mechanical seal of residual heat removal pump.
Fig. 4 is the worm's eye view of a kind of mechanical seal for residual heat removal pump of the present invention.
Fig. 5 is of the present invention a kind of for machine envelope exhaust port schematic diagram in the mechanical seal of residual heat removal pump.
Fig. 6 is of the present invention a kind of for machine envelope leakage interface diagram in the mechanical seal of residual heat removal pump.
Embodiment
Refer to Fig. 1 to Fig. 6, the present inventor, in order to understand technological scheme of the present invention better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
Refer to Fig. 1 to Fig. 3, the mechanical seal of a kind of residual heat removal pump of the present invention comprises: gland seal device 100 and pump cover 200.Gland seal device 100 is socketed on the pump shaft 300 of residual heat removal pump.The machine envelope cooling chamber 11 of this mechanical seal is formed between gland seal device 100 and pump cover 200 radial direction.The below of this mechanical seal is the pump chamber 400 of residual heat removal pump, pump chamber 400 and machine seal the water pilot bearing 401 and impeller ring 402 that to be provided with between cooling chamber 11 between pump cover 200 and pump shaft 300 radial direction, reactor coolant in pump chamber 400 is by the gap ingress engine envelope cooling chamber 11 between water pilot bearing 401 and impeller ring 402, again by sealing after the heat exchanger 500 that cooling chamber 11 is connected with this machine, be back to this machine envelope cooling chamber 11, gland seal device 100 is rinsed and cooled.
Refer to Fig. 3, gland seal device 100 comprises machine envelope axle sleeve 1, rotating seat 2, rotating ring 3, machine sealed cover 4, stationary seat 5, stationary ring 6, seal ring 7, restrictor ring 8 and baffle plate 9.
Machine envelope axle sleeve 1 is fixedly sleeved on the excircle of pump shaft 300, and locates with the excircle shaft shoulder of water pilot bearing 401.
The bottom of the excircle of machine envelope axle sleeve 1 is provided with lower large three little stage terraces.Rotating seat 2 is arranged between machine envelope the first stage terrace of axle sleeve 1 bottom and second-order step surface, and seal with machine that the excircle of axle sleeve 1 is radial to be fixed.The bottom surface of rotating seat 2 is fixed on the first stage terrace of machine envelope axle sleeve 1 bottom, makes rotating seat 2 and machine seal axle sleeve 1 axial restraint.Between the second-order step surface and the 3rd stage terrace of machine envelope axle sleeve 1 bottom, the radial clearance of annular is defined between the excircle that the inner circumference of rotating seat 2 and machine seal axle sleeve 1, rotating ring 3 is arranged in the radial clearance of this annular, and the inner circumference of the excircle of rotating ring 3 and rotating seat 2 is fixed.In residual heat removal pump running, rotating ring 3 is followed pump shaft 300 and is rotated.
The excircle that machine sealed cover 4 and machine seal axle sleeve 1 is socketed, and the shaft shoulder of orientating as between the bottom surface of machine sealed cover 4 and the end face of pump cover 200 is located, and the bottom surface of machine sealed cover 4 and the end face of pump cover 200 are fixed by bolt or stud.Seal ring 7 and restrictor ring 8 all seal between the radial direction of axle sleeve 1 at machine sealed cover 4 and machine.Wherein restrictor ring 8 is positioned at the top of seal ring 7.Restrictor ring 8 and machine seal between axle sleeve 1 and are in forced contact state.The excircle of seal ring 7 is fixed on the inner circumference of machine sealed cover 4, and the inner circumference of seal ring 7 and machine seal between axle sleeve 1 and leave radial clearance.The inner circumference of stationary seat 5 and the excircle of seal ring 7 are fixed.Meanwhile, the end face of stationary seat 5 is connected with the some springs 10 of the underrun of machine sealed cover 4.These several springs 10 are all in compressive state, and these several springs 10 are all arranged in the blind hole bottom machine sealed cover 4, and peripheral hardware protecting jacket.The excircle of stationary ring 6 and the inner circumference of stationary seat 5 are fixed, and the end face of stationary ring 6 and the bottom surface of seal ring 7 are fixed.Because these several springs 10 are all in compressive state, therefore the pressure that stationary seat 5 one is downward is given, then this downward pressure is passed to stationary ring 6 by stationary seat 5, like this, be in forced contact state between the end face of rotating ring 3 and the bottom surface of stationary ring 6, between the end face of rotating ring 3 and the bottom surface of stationary ring 6, form the shaft seal end face of gland seal device 100.The object arranging seal ring 7 is: be conducive to the size and the base area that increase stationary ring 6, improve the validity of gland seal device 100, thus ensure the validity of mechanical seal.
Like this, the chamber of pump cover 200, rotating ring 3, formation between stationary ring 6 and machine sealed cover 4 is machine envelope cooling chamber 11.The chamber of seal ring 7, restrictor ring 8, machine envelope axle sleeve 1, rotating ring 3, formation between stationary ring 6 and machine sealed cover 4 is machine envelope leakage chamber 12.Restrictor ring 8 and machine seal and be in forced contact state between axle sleeve 1 is in order to when gland seal device 100 occurs to leak, and the reactor coolant in anti-stop machine envelope leakage chamber 12 is from the clearance leakage between this machine envelope axle sleeve 1 and restrictor ring 8.
Baffle plate 9 is positioned on the end face of restrictor ring 8 and machine sealed cover 4, and restrictor ring 8 and machine sealed cover 4 are fixed by baffle plate 9, prevents restrictor ring 8 from occurring when gland seal device 100 leaks to loosen.Also fixed by positioning block 91 between the end face of baffle plate 9 and machine sealed cover 4.
Owing to having removed original pump efficiency ring in gland seal device 100, rotating ring 3, stationary ring 6, the machine that directly defines between machine sealed cover 4 and pump cover 200 seal cooling chamber 11, in machine envelope cooling chamber 11, the flowing velocity of reactor coolant is accelerated, the temperature of reactor coolant reduces, decrease the impact of reactor coolant on gland seal device 100, ensure that when residual heat removal pump transfer reaction reactor coolant, the validity of mechanical seal.
Refer to Fig. 4, pump cover 200 be circumferentially also provided with machine seal cooling water import 210 and machine seal cooling water outlet 220, machine is sealed cooling chamber 11 to be communicated with external heat exchanger 500, wherein machine seal cooling water import 210 connects the outlet of heat exchanger 500, the import that machine seal cooling water outlet 220 connects heat exchanger 500, this model machine envelope cooling chamber 11 just and heat exchanger 500 define a heat circulating system.Reactor coolant in pump chamber 400 is after passing through the gap between water pilot bearing 401 and impeller ring 402, and ingress engine seals cooling chamber 11.The object adopting the shaft shoulder to locate between machine envelope axle sleeve 1 and water guide shaft 401 hold is: before reactor coolant carries out flushing cooling to machine end-blocking face, make reactor coolant have the abundant time to cool.First machine envelope cooling chamber 11 is discharged from machine seal cooling water outlet 220 from the reactor coolant in pump chamber 400 ingress engine envelope cooling chamber 11, enter after heat exchanger 500 cools, again through machine seal cooling water import 210, backflow ingress engine envelope cooling chamber 11, carries out flushing cooling to the shaft seal end face of gland seal device 100.Reactor coolant forms liquid protective film on shaft seal end face, reduces the friction factor of the shaft seal end face of gland seal device 100, reduces the frictional heat of shaft seal end face, ensures the validity of mechanical seal.
Refer to Fig. 5 and Fig. 6, the machine that is circumferentially also provided with of pump cover 200 seals exhaust port 230 and machine envelope leakage interface 240 in addition.
Refer to Fig. 5, machine envelope exhaust port 230 connects the import of heat exchanger 500.Machine envelope exhaust port 230 is divided into junctor to seal the radial direction through hole 231 of the import of cooling chamber 11 and heat exchanger 500, and by pump cover 200 bottom surface, the i.e. outlet pipe 232 that is communicated with radial direction through hole 231 of the pump chamber 400 of residual heat removal pump, by outlet pipe 232 and radial direction through hole 231, reactor coolant in the pump chamber 400 of residual heat removal pump directly can be delivered into the import of heat exchanger 500 on the one hand, after the cooling through over-heat-exchanger 500, through machine seal cooling water import 210, be back to machine envelope cooling chamber 11, reduce the reactor coolant of high temperature directly to the possibility that described shaft seal end face rinses, gland seal device 100 is avoided to lose efficacy because of the impact of reactor coolant, ensure that the validity of mechanical seal.In addition on the one hand, the air in machine envelope cooling chamber 11 enters pump chamber 400 by outlet pipe 232 and then discharges residual heat removal pump.
Refer to Fig. 6, it is the radial blind holes be positioned on pump cover 200 excircle that machine envelope leaks interface 240, and machine envelope leaks the import that interface 240 connects heat exchanger 500.Correspondingly, a drainage tube 41 is also provided with in machine sealed cover 4, machine is sealed leakage chamber 12 and machine and seals and leak interface 240 and be communicated with by drainage tube 41, when gland seal device 100 occurs to leak, reactor coolant in machine envelope leakage chamber 12 can leak interface 240 by drainage tube 41 and machine envelope and enter heat exchanger 500, thus prevent reactor coolant from occurring further to leak along the axis of pump shaft 300, and the reactor coolant sealed by machine in leakage chamber 12 reclaims, reduce the temperature of gland seal device 100 being carried out to the reactor coolant rinsing cooling simultaneously, mechanical seal is recovered effectively.
In the present embodiment, stationary ring 6 and the rotating ring 3 of gland seal device 100 are all made up of silicon carbide.Ensure that gland seal device 100 enough bears sufficiently high temperature and do not lose efficacy, simultaneously silicon carbide is wear-resisting and at the bottom of friction factor, ensure that effective running of residual heat removal pump, prevents the chip in gland seal device 100 running from entering reactor coolant.
In order to ensure the validity of mechanical seal, between machine envelope axle sleeve 1 and pump shaft 300, between machine envelope axle sleeve 1 and rotating seat 2, between rotating seat 2 and rotating ring 3, between pump cover 200 and machine sealed cover 4, between seal ring 7 and machine sealed cover 4, between stationary seat 5 and seal ring 7, between stationary ring 6 and seal ring 7, and be equipped with O-ring seals between stationary ring 6 and stationary seat 5.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (5)
1., for a mechanical seal for residual heat removal pump, comprise pump cover (200) and fixedly sleeved gland seal device (100) on pump shaft (300),
Described gland seal device (100) comprising: machine envelope axle sleeve (1), rotating seat (2), rotating ring (3), machine sealed cover (4), stationary seat (5), stationary ring (6) and restrictor ring (8), described machine envelope axle sleeve (1) is fixedly sleeved on described pump shaft (300), the fixedly sleeved bottom described machine envelope axle sleeve (1) of described rotating seat (2), described rotating ring (3) is fixed on described rotating seat (2), described machine sealed cover (4) is fixed on the end face of described pump cover (200), the end face of described stationary seat (5) is connected with the bottom surface elasticity of described machine sealed cover (4), described stationary ring (6) is fixed on described stationary seat (5), make the end face of described rotating ring (3) and the bottom surface forced contact of described stationary ring (6), described restrictor ring (8) is positioned between described machine envelope axle sleeve (1) and described machine sealed cover (4) radial direction, and the machine that is circumferentially also provided with envelope exhaust port (230) of described pump cover (200), is characterized in that:
Described rotating ring (3), described stationary ring (6), between described machine sealed cover (4) and described pump cover (200) forming machine envelope cooling chamber (11); Described machine seals cooling chamber (11), and by being positioned at described pump cover (200), circumferentially machine seal cooling water import (210) and machine seal cooling water outlet (220) are communicated with external heat exchanger (500);
Forming machine envelope leakage chamber (12) between described rotating ring (3), described stationary ring (6), described restrictor ring (8), described machine sealed cover (4) and described machine envelope axle sleeve (1),
Described machine envelope exhaust port (230) comprising: the radial direction through hole (231) described machine envelope cooling chamber (11) be communicated with described heat exchanger (500), and by outlet pipe (232) that the bottom surface of described pump cover (200) is communicated with described radial direction through hole (231)
The machine that is circumferentially also the provided with envelope of described pump cover (200) leaks interface (240), described machine envelope leaks the radial blind holes that interface (240) is the described heat exchanger of a connection (500), be provided with drainage tube (41) in described machine sealed cover (4), described machine envelope leakage chamber (12) and described machine seal and leak interface (240) and be communicated with by described drainage tube (41).
2. a kind of mechanical seal for residual heat removal pump according to claim 1, it is characterized in that: the inner circumference of described machine sealed cover (4) is fixed with seal ring (7), described seal ring (7) is positioned at the below of described restrictor ring (8), the bottom surface of described seal ring (7) and the end face of described stationary ring (6) are fixed, and the excircle of described seal ring (7) and the inner circumference of described stationary seat (5) are fixed.
3. a kind of mechanical seal for residual heat removal pump according to claim 1, it is characterized in that: the end face of described stationary seat (5) is connected with several springs of underrun (10) of described machine sealed cover (4), these several springs (10) are all in compressive state, make the end face of described rotating ring (3) and the bottom surface forced contact of described stationary ring (6).
4. a kind of mechanical seal for residual heat removal pump according to claim 1, it is characterized in that: described rotating seat (2) inner circumference and described machine seal between axle sleeve (1) excircle radial direction and leave radial clearance, described rotating ring (3) is arranged in this radial clearance, and the inner circumference of the excircle of described rotating ring (3) and described rotating seat (2) is fixed.
5. a kind of mechanical seal for residual heat removal pump according to claim 1, is characterized in that: described machine sealed cover (4) is fixed by the baffle plate (9) being positioned at described machine sealed cover (4) and described restrictor ring (8) end face with described restrictor ring (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125969.7A CN103195742B (en) | 2013-04-12 | 2013-04-12 | A kind of mechanical seal for residual heat removal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125969.7A CN103195742B (en) | 2013-04-12 | 2013-04-12 | A kind of mechanical seal for residual heat removal pump |
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| CN103195742A CN103195742A (en) | 2013-07-10 |
| CN103195742B true CN103195742B (en) | 2016-04-20 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352873B (en) * | 2013-07-30 | 2016-04-13 | 强胜精密机械(苏州)有限公司 | The spiral flow constant-pressure pump improved |
| CN106837873A (en) * | 2016-12-12 | 2017-06-13 | 大连鹏华泵业制造有限公司 | Plastic vertical pump |
| WO2019080139A1 (en) * | 2017-10-29 | 2019-05-02 | 张拥军 | Sealed centrifugal pump with high temperature resistance |
| CN111980960B (en) * | 2020-07-31 | 2024-07-16 | 中核核电运行管理有限公司 | Water seal device for mechanical seal of hydrodynamic pressure type main pump of nuclear power station |
| CN118293092B (en) * | 2024-05-07 | 2024-11-15 | 江苏永一泵业科技集团有限公司 | Sealing mechanism of a hot water pump |
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| CN101131208A (en) * | 2006-09-18 | 2008-02-27 | 丹东克隆集团有限责任公司 | Anticlogging mechanical sealing device |
| CN201714677U (en) * | 2010-07-07 | 2011-01-19 | 沈阳鼓风机集团有限公司 | Residual heat removal pump of nucleus secondary pump for pressurized water reactor nuclear power plant |
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| CN203257727U (en) * | 2013-04-12 | 2013-10-30 | 上海阿波罗机械股份有限公司 | Mechanical seal for residual heat removal pump |
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2013
- 2013-04-12 CN CN201310125969.7A patent/CN103195742B/en active Active
Patent Citations (5)
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| US3843140A (en) * | 1971-11-24 | 1974-10-22 | Feodor Burgmann Fa | Cooled mechanical seal |
| CN101131208A (en) * | 2006-09-18 | 2008-02-27 | 丹东克隆集团有限责任公司 | Anticlogging mechanical sealing device |
| CN201714677U (en) * | 2010-07-07 | 2011-01-19 | 沈阳鼓风机集团有限公司 | Residual heat removal pump of nucleus secondary pump for pressurized water reactor nuclear power plant |
| CN102606534A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Waste heat discharge pump for nuclear power plant |
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Non-Patent Citations (1)
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